/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineGameItemStatsInterface.h
Updates items used and by who
void ItemUsage ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [FString](API\Runtime\Core\Containers\FString) & ItemUsedBy, const [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & ItemsUsed, [FOnItemUsageComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnItemUsageComplete) CompletionDelegate )